Muscles of Post Compartment of Leg

Question 0

soleus

Answer 0

O: post aspect of head of fibula, sup 1/4 of post surface of fibula, soleal line, medial border of tibia
I: post surface of calcaneus via calcaneal tendon
N: tibial neve S1, S2
A: plantar flexes ankle, steadies leg on foot

Question 1

gastrocnemius

Answer 1

O: lateral head– lateral aspect of lateral condyle of femur
medial head– popliteal surface of femur, sup to med condyle
I: post surface of calcaneus via calcaneal tendon
N: tibial nerve S1, S2
A: plantar flexes ankle when knee is extended, raises heel when
walking, flexes leg at knee joint

Question 2

plantaris

Answer 2

O: inf end of lateral supracondylar line of femur,
oblique popliteal ligament
I: post surface of calcaneus via calcaneal tendon
N: tibial nerve S1, S2
A: weakly assists gastrocnemius

Question 3

popliteus

Answer 3

O: lat surface of lat condyle and lat meniscus
I: post surface of tibia, sup to soleal line
N: tibial nerve L4, L5, S1
A: weakly flexes knee, unlocks knee by lat rotating femur on fixed
tibia or medially rotating tibia of unplanted limb

Question 4

flexor hallicis longus

Answer 4

O: inf 2/3 of post surface of fibula, inf part of interosseus
membrane
I: base of distal phalanx of great toe
N: tibial nerve S2, S3
A: flexes great toe at all joints, weakly plantar flexes ankle,
supports med longitudinal arch of foot

Question 5

flexor digitorum longus

Answer 5

O: med part of post surface of tibia inf to soleal line,
fibula by a broad tendon
I: bases of distal phalanges of lateral 4 digits
N: tibial neve S2, S3
A: flexes lat 4 digits, plantar flexes ankle, supports lateral
longitudinal ligament of foot

Question 6

tibialis posterior

Answer 6

O: interosseus membrane, post surface of tibia inf to soleal line,
post surface of fibula
I: tuberosity of navicular (primarily)
cuneiforms, cuboid, bases of 2-4 metatarsals
N: tibial nerve L4, L5
A: plantar flexes angle, inverts foot, supports med longitudinal
arch of foot